In cooking, to core means to remove the tough, inedible center of a fruit or vegetable, including seeds, fibrous membranes, and dense stem tissue. It’s one of the most common prep steps in the kitchen, and the technique varies depending on what you’re working with. An apple core looks nothing like a cabbage core, so the method changes accordingly.
What You’re Actually Removing
The “core” of a fruit or vegetable is the central part that’s too tough, too seedy, or too fibrous to eat comfortably. In an apple or pear, that means the cluster of seeds and the hard flesh surrounding them. In a tomato, it’s the pale, woody spot where the stem connects. In a head of cabbage or iceberg lettuce, it’s the dense, solid base that holds the leaves together. In a bell pepper, it’s the white membrane and seed cluster inside.
Coring doesn’t always mean the same thing across every ingredient. For something like a pineapple, you’re removing a tough, fibrous cylinder running down the center. For a strawberry, you’re just scooping out the small white cone beneath the stem. The goal is always the same: get rid of the parts that would ruin the texture or taste of your finished dish.
Coring vs. Pitting
These terms sometimes overlap, but they refer to different things. Coring applies to fruits and vegetables with multiple seeds or a fibrous center, like apples, pears, tomatoes, and peppers. Pitting applies to stone fruits with a single large seed, like peaches, cherries, and plums. You pit a peach; you core an apple. In industrial food processing, the two techniques are sometimes combined for fruits like clingstone peaches, where removing the pit also means cutting out a cylinder of the surrounding flesh. But in a home kitchen, coring and pitting are separate tasks with separate tools.
How to Core Common Fruits and Vegetables
Apples and Pears
The simplest approach is a cylindrical apple corer, a tube-shaped tool you push straight down through the center of the fruit. It punches out the seeds and surrounding flesh in one piece. If you don’t have one, cut the fruit in half, then in quarters, and slice the seed pocket out of each quarter with a paring knife.
Tomatoes
Set the tomato stem-side up on your cutting board. Insert a sharp paring knife at roughly a 25-degree angle about half an inch from the stem, then cut in a circle while rotating the tomato. The core pops out as a small cone. If your recipe calls for seeding as well, slice the tomato into quarters after removing the top core, then run your knife along the inside wall to scrape away the seeds and the white interior flesh. Dedicated tomato corers have a small, serrated edge designed specifically for this job.
Cabbage and Lettuce
Cut the head in half through the center. You’ll see the dense, pale core at the base of each half. Cut a V-shape around it where the tough part meets the leafy part, and pull it out. For a whole cabbage that you want to keep intact (for stuffed cabbage, for instance), you can push an apple corer into the base, twist, and pull the core out in one piece. A sturdy metal spoon also works: halve the cabbage and scrape the spoon’s edge around the core to loosen it, then pull it free with your fingers.
Bell Peppers
Slice off the top just below the stem, then reach inside and pull out the seed cluster and white membranes by hand. You can also cut the pepper in half lengthwise and scrape the seeds and ribs out with a knife. Either way, the goal is to remove everything that’s pale and crunchy inside, since those parts are bitter and have a papery texture.
Pineapple
After slicing off the top and bottom and cutting away the outer skin, you’ll see a pale, fibrous circle in the center of each slice. That’s the core. You can cut it out with a paring knife, punch it out with a small round cookie cutter, or use a dedicated pineapple corer that spirals through the whole fruit at once, removing the core and slicing the flesh in a single motion.
Tools That Make Coring Easier
A sharp paring knife handles most coring jobs. Beyond that, a few specialized tools speed things up if you’re working with large quantities. Cylindrical apple corers are the most common and cost just a few dollars. Pineapple corers double as slicers, spiraling through the fruit to leave behind rings of ready-to-eat flesh. Tomato corers feature small serrated tips that grip the tough stem area without crushing the soft fruit around it.
A melon baller also works in a pinch for scooping cores out of halved pears or apples when you want a clean, rounded cavity.
Staying Safe While Coring
Most coring injuries come from applying too much force to a round, unstable object. A few habits prevent this. First, always create a flat surface: if a fruit or vegetable wants to roll, slice a thin piece off one side so it sits flat on your cutting board. Second, use a sharp knife. Dull blades require more pressure and are far more likely to slip. Third, grip the knife with your fingers wrapped around the handle and your thumb resting on the spine of the blade for control. Keep your cutting board stable on the counter. A damp towel underneath stops it from sliding.
Pineapples and winter squash deserve extra caution because they’re dense and require real force to cut through. Stand them upright on a flat, cut end before slicing downward, and let the knife’s sharpness do the work rather than muscling through.
What to Do With the Scraps
Cores don’t have to go straight into the trash. Apple cores (seeds removed) are full of pectin and make excellent jelly or can be simmered into a simple syrup. Cabbage and cauliflower cores are surprisingly good roasted: toss them in oil, season with salt and pepper, and roast at high heat until golden. Cauliflower cores can also be blanched and pickled, then added to relishes, salads, or salsas. Pineapple cores are tough but edible, and they blend smoothly into smoothies or can be simmered in water with sugar to make pineapple simple syrup.
Vegetable cores and trimmings in general, including onion ends, celery bases, and pepper ribs, can be collected in a bag in your freezer. Once the bag is full, simmer everything in water for about an hour and you have homemade vegetable stock at essentially zero cost.